MIC1815_05 Datasheet, PDF (1/6 Pages) Micrel Semiconductor – Microprocessor Reset Circuit

MIC1815
MIC1815
Microprocessor Reset Circuit
Micrel
General Description
The MIC1815 is an inexpensive microprocessor supervisory
circuit that monitors power supplies in microprocessor based
systems.
The function of these devices is to assert a reset if the power
supply drops below a designated reset threshold level. Several
different reset threshold levels are available to accommodate
10% or 20% drop in 3.3V powered systems.
The MIC1815 has an active low /RESET output. The reset
output is guaranteed to remain asserted for a minimum of
100ms after V_CChas risen above the designated reset thresh-
old level. The MIC1815 comes in a 3-pin SOT-23 package.
Features
• Precision voltage monitor for 10% or 20% drop in 3.3V
power supplies
• /RESET remains valid with V_CC as low as 1V
• 5µA supply current
• 100ms minimum reset pulse width
• No external components required
• Available in 3-pin SOT-23 package
Applications
• Portable equipment
• Intelligent instruments
• Critical microprocessor power monitoring
• Printers/computers
• Embedded controllers
Ordering Information
Part Number
MIC1815-10U
MIC1815-20U
MIC1815-10UY
MIC1815-20UY
Marking
ND
NE
ND
NE
Threshold
Voltage
2.88V
2.55V
2.88V
2.55V
Operating Temp. Range
–40°C to +85°C
–40°C to +85°C
–40°C to +85°C
–40°C to +85°C
Package
SOT-23
SOT-23
SOT-23
SOT-23
Pb-Free
No
No
Yes
Yes
Typical Application
VCC
VCC
MIC1815
RESET
VCC
µP
RESET
Micrel, Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 [phone] • fax + 1 [phone] • http://www.micrel.com
July 2005
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MIC1815